Novel ferronickel electric furnace cover

Abstract

The utility model relates to the field of iron alloy smelting equipment, in particular to a novel ferro-nickel electric furnace cover, which mainly comprises 6-18 edge furnace covers, a central furnace cover and the like, and the central furnace cover comprises 3 central components; an insulating material is arranged between the adjacent edge furnace cover and the center assembly, the edge furnace cover and the center assembly are connected through a plurality of bolt groups to form a complete furnace cover, and an insulating pad and an insulating sleeve are arranged between the bolt groups and the contact surface of the metal material; each of the edge furnace cover and the central assembly structurally comprises a high-temperature-resistant thermal insulation coating, a knotting material, a nano high-temperature thermal insulation plate and a shell from inside to outside in sequence; the shell and the reinforcing ribs of the edge furnace cover are made of Q235B; a shell of the center assembly is made of 0Cr18Ni9 and is of a double-layer hollow structure, and a plurality of partition plates perpendicular to an inner-layer wall plate and an outer-layer wall plate are welded between the inner-layer wall plate and the outer-layer wall plate to form a cooling air channel which is communicated with a cooling air connector welded to the outer-layer wall plate. According to the scheme, the problems that an existing furnace cover is high in smelting energy consumption, poor in working reliability and use safety and the like are effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of ferroalloy smelting equipment, in particular to a novel nickel-iron electric furnace cover. Background Art

[0002] Submerged arc furnace is an important equipment for producing ferroalloys. Its mechanical equipment is mainly composed of furnace shell, furnace cover, charging system, water cooling system, exhaust ventilation and dust removal system, electrode holder and electrode hydraulic system. The furnace cover is an important part of the mechanical equipment of submerged arc furnace. Its main function is to seal the high-temperature flue gas in the furnace, reduce the impact of dust and high-temperature flue gas on the surrounding environment, and shield the arc heat radiation. At present, the RK-EF process, that is, the rotary kiln-electric furnace process, is mainly used for smelting nickel iron from laterite nickel ore. Under normal production conditions, the temperature at the top of the nickel iron electric furnace is about 1000℃, and in extreme cases it can reach 1350℃. In order to ensure normal production, the furnace cover of the nickel iron electric furnace is generally cooled by water. This type of water-cooling furnace cover has the following main problems: First, the cooling channel of the furnace cover is welded from metal plates, and there are a large number of welds, which inevitably lead to welding defects, which in turn lead to cooling water leakage, bringing adverse effects on normal production and even causing serious accidents; Second, the entire furnace cover uses water cooling to take away a large amount of high-temperature heat, which is not conducive to reducing smelting energy consumption; Third, the overall material consumption and weight of the furnace cover are increased. Utility Model Content

[0003] In order to solve the above problems, the utility model proposes a new type of nickel-iron electric furnace cover, which adopts a new structural form and is made of suitable insulation materials and metal materials; the edge furnace cover part adopts natural air cooling, and the central furnace cover part adopts forced air cooling; the furnace cover greatly reduces the smelting energy consumption and improves the reliability of the production process.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows: a new type of nickel-iron electric furnace cover is mainly composed of 6 to 18 edge furnace covers and 1 central furnace cover, and the central furnace cover is composed of 3 central components; insulating plates are installed between adjacent edge furnace covers and central components and connected by multiple bolt groups to form a complete furnace cover, and insulating pads and insulating sleeves are installed between the bolt groups and the contact surface of the metal material; the structures of the edge furnace cover and the central component are high-temperature resistant heat-insulating coating, knotting material, nano high-temperature insulation board and shell from the inside to the outside; the shell and reinforcing ribs of the edge furnace cover are made of Q235B; the shell of the central component is made of 0Cr18Ni9, which is a double-layer hollow structure, and multiple partitions perpendicular to it are welded between the inner and outer wall panels to form a cooling air channel and communicate with the cooling air interface welded on the outer wall panel. When installing the furnace cover, the cooling air interface on each central component is respectively connected to the external cooling air source and the discharge interface, and the central furnace cover is cooled by forced air cooling, which reduces the occurrence of safety accidents compared with cooling water.

[0005] Preferably, the above-mentioned novel nickel-iron electric furnace cover adopts a full penetration welding structure between the various parts constituting the cooling air passage of the central component shell.

[0006] Preferably, the above-mentioned novel nickel-iron electric furnace cover has a plurality of slag nails made of the same material welded on the inner surfaces of the edge cover shell and the center component shell, respectively.

[0007] Preferably, the above-mentioned new nickel-iron electric furnace cover has a high-temperature resistant heat-insulating coating sprayed on the surface of the knotted material, with a thickness of 4 to 10 mm and a long-term use temperature of not less than 1800°C.

[0008] Preferably, the above-mentioned novel nickel-iron electric furnace cover has a knotted material coated on the outside of the nano high-temperature insulation board and the slag nails, with a thickness of 120 to 200 mm and a refractoriness of not less than 1700°C.

[0009] Preferably, the above-mentioned novel nickel-iron electric furnace cover has a nanometer high-temperature insulation plate pasted on the inner surface of the edge furnace cover shell and the central component shell, with a thickness of 40 to 100 mm and a use temperature of not less than 1000°C.

[0010] The beneficial effects of the utility model are as follows: the high temperature resistant heat insulation coating is a high temperature insulation material with stable performance. Spraying it on the surface of the knotted material reduces the scouring and ablation of the knotted material by high temperature flue gas, and also reduces the heat loss in the furnace to a certain extent; the thermal conductivity of the nano high temperature insulation board is very low, only 0.03W / (m▪K) at 800℃, and pasting the nano high temperature insulation board on the inner surface of the edge furnace cover shell and the center component shell has a significant effect on reducing the heat loss in the furnace and the temperature of the furnace shell metal material; the forced air cooling structure is adopted in the center furnace cover area where the temperature in the furnace is relatively high, which effectively reduces the temperature of this area and greatly improves the safety and reliability of the entire furnace cover. In short, the nickel-iron electric furnace cover using this technical solution effectively reduces the smelting energy consumption, reduces the metal material consumption and weight of the furnace cover, and at the same time improves its working reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 It is a top view of Example 1 of the utility model (schematic diagram, including 18 edge furnace covers).

[0013] Figure 2 It is a top view of Example 2 of the utility model (schematic diagram, including 6 edge furnace covers).

[0014] Figure 3 for Figure 1 , 2 Top view of the center furnace cover (schematic diagram).

[0015] Figure 4 Schematic diagram of the central component 1 (in order to show the basic internal structure of the central component, its outer wall panel is removed in the figure).

[0016] Figure 5 for Figure 1 , 2 AA section view (schematic diagram).

[0017] Figure 6 for Figure 1 , 2 BB cross-sectional view (schematic diagram).

[0018] Figure 7 for Figure 1 , 2 CC cross-sectional view (schematic).

[0019] Figure 8 for Figure 3 DD cross-sectional view (schematic).

[0020] Fig. 9 for Figure 4 EE cross-sectional view (schematic).

[0021] In the figure: 1. edge furnace cover, 2. center furnace cover, 201. first center component, 202. second center component, 203. third center component, 204. first cooling air interface, 205. second cooling air interface, 3. high temperature resistant heat insulation coating, 4. knotting material, 5. nano high temperature insulation board, 6. slag nails, 7. edge furnace cover shell wall panel, 8. edge furnace cover connecting plate, 9. bolt assembly, 10. insulation pad, 11. insulation board, 12. insulation sleeve, 13. center component connecting plate, 14. center component outer wall panel, 15. center component partition, 16. center component inner wall panel, 17. edge furnace cover shell reinforcement rib. DETAILED DESCRIPTION

[0022] [Example 1]

[0023] Figure 1 and Figures 3 to 9 The figure shows a typical embodiment 1 of the utility model. In this embodiment, the nickel-iron electric furnace cover is mainly composed of 18 edge furnace covers (1) and 1 central furnace cover (2), and the first central component (201), the second central component (202) and the third central component (203) constitute the central furnace cover (2).

[0024] The outer shell of each central component is made of 0Cr18Ni9 material and is a double-layer hollow structure, mainly including a central component connecting plate (13), a central component outer wall plate (14), a central component partition plate (15) and a central component inner wall plate (16); the central component partition plate (15) is welded between the central component outer wall plate (14) and the central component inner wall plate (16) to form a cooling air channel; the first cooling air interface (204) and the second cooling air interface (205) are welded on the central component outer wall plate (14) and communicated with the cooling air channel. When installing the furnace cover, the cooling air interface on each central component is respectively connected to the external cooling air source and the exhaust interface, and the central furnace cover (2) is cooled by forced air cooling. The number, size and structure of the cooling air channels are determined according to theoretical calculations and design experience. In order to prevent the cooling air from leaking into the electric furnace, the welding joints between the components adopt a full penetration welding structure.

[0025] The outer shell of the edge furnace cover (1) is mainly composed of an edge furnace cover outer shell wall plate (7), an edge furnace cover connecting plate (8) and an edge furnace cover outer shell reinforcing rib (17), and is made of Q235B material.

[0026] A plurality of slag pins (6) made of Q235B material are welded on the inner surface of the outer shell of the edge furnace cover (1); a plurality of slag pins (6) made of 0Cr18Ni9 material are welded on the inner surface of the outer shell of the first central component (201), the second central component (202) and the third central component (203); the number and layout of the slag pins (6) are determined based on theoretical calculations and experience.

[0027] An insulating plate (11) is installed between adjacent edge furnace covers (1) and central components, which are connected together via a bolt assembly (9) to form a complete furnace cover; an insulating pad (10) and an insulating sleeve (12) are installed between the contact surfaces between the bolt assembly (9) and the outer shell of the edge furnace cover (1) and the outer shell metal material of the first central component (201), the second central component (202) and the third central component (203).

[0028] A nanometer high temperature insulation board (5) is pasted on the inner surface of the outer shell of the edge furnace cover (1), the first central component (201), the second central component (202) and the third central component (203). The thickness of the nanometer high temperature insulation board (5) is 40 to 100 mm and the use temperature is not less than 1000° C. In practical applications, the optimal thickness should be determined based on theoretical calculations and experience.

[0029] The outer layer of the nano high temperature insulation board (5) is a knotting material (4) with a thickness of 120 to 200 mm and a refractoriness of not less than 1700° C. The knotting material (4) covers the slag nails (6) to prevent scouring and ablation by high temperature flue gas.

[0030] The high temperature resistant heat insulating coating (3) is sprayed on the surface of the knotting material (4) with a thickness of 4 to 10 mm and a long-term use temperature of not less than 1800° C. The high temperature resistant heat insulating coating (3) can effectively prevent the high temperature flue gas from scouring and ablating the surface of the knotting material (4) and the slag nails (6), thereby reducing the use temperature of the nano high temperature insulation board (5) to a certain extent. In practical applications, the optimal thickness should be determined based on theoretical calculations and experience.

[0031] [Example 2]

[0032] Figures 2 to 9 The following is a typical embodiment 2 of the utility model. In this embodiment, the nickel-iron electric furnace cover is mainly composed of 6 edge furnace covers (1) and 1 center furnace cover (2). The remaining description is the same as the above-mentioned embodiment 1 and will not be repeated here.

[0033] In the description of the present invention, it should be understood that the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as terms indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the present invention, "plurality" means at least two, such as two, three, etc.; in actual applications, ordinary technicians in this field can determine the specific number based on calculations or design experience.

[0034] The above description is only a typical embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiment 1 and embodiment 2, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A new type of nickel-iron electric furnace cover, mainly composed of 6 to 18 edge furnace covers and 1 central furnace cover, the central furnace cover is composed of 3 central components; insulating plates are installed between adjacent edge furnace covers and central components and connected by multiple bolt groups to form a complete furnace cover, and insulating pads and insulating sleeves are installed between the bolt groups and the contact surface of the metal material; the characteristics are: The structures of the edge furnace cover and the central component are, from the inside to the outside, high-temperature resistant heat-insulating coating, knotting material, nano high-temperature insulation board and outer shell; the outer shell and reinforcing ribs of the edge furnace cover are made of Q235B; the outer shell of the central component is made of 0Cr18Ni9, which is a double-layer hollow structure, with multiple partitions perpendicular to the inner and outer wall panels welded between them to form a cooling air channel and connected to the cooling air interface welded on the outer wall panel.

2. The novel nickel-iron electric furnace cover according to claim 1 is characterized in that: The various parts constituting the cooling air passage of the central component housing adopt a full penetration welding structure.

3. The novel nickel-iron electric furnace cover according to claim 1 is characterized in that: A plurality of slag hanging nails made of the same material as the edge furnace cover shell and the center component shell are respectively welded on the inner side surfaces thereof.

4. The novel nickel-iron electric furnace cover according to claim 1 is characterized in that: The high temperature resistant heat insulation coating is sprayed on the surface of the knotted material, with a thickness of 4 to 10 mm and a long-term use temperature of not less than 1800°C.

5. The novel nickel-iron electric furnace cover according to claim 1 is characterized in that: The knotting material is coated on the outside of the nano high temperature insulation board and the slag nails, with a thickness of 120 to 200 mm and a refractoriness of not less than 1700°C.

6. The novel nickel-iron electric furnace cover according to claim 1 is characterized in that: The nano high temperature insulation board is pasted on the inner surface of the edge furnace cover shell and the center component shell, with a thickness of 40 to 100 mm and a use temperature of not less than 1000°C.

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